Would it be possible to setup an option to allow a logged in user to mark a particular posting/postings of interest in any of the forum classifications? That way when I login to the message board, I could bring up the postings of high interest to me... Is this at all possible?

that feature is not part of the standard forum software. but as Jeff
suggests, the URL's of the posts do not change (until we migrate to a
newer version of the software. I'll keep your request in mind.
there might be an add-on somewhere.

another feature that is available, is that you can be informed by mail if somebody posts a response on some item of interest.
Dunno if that might help partially ? it can be found on the bottom of the screen : "watch this topic"